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Note 9 - Capital Transactions (Tables)
12 Months Ended
Mar. 31, 2022
Notes Tables  
Schedule of Stockholders' Equity Note, Warrants or Rights [Table Text Block]
  

Warrants Outstanding

 
  

Number of Shares

  

Exercise Price

 
        

Outstanding at March 31, 2020

  84,538,161    

Warrants issued

  43,493,809  

$0.10

 

Warrants exercised

  (35,798,809)  

0.03000.03535

 

Warrants expired/cancelled

  (6,390,125)  0.6000.9090 

Outstanding at March 31, 2021

  85,843,036    
Warrants issued  2,095,333  $0.10 

Warrants exercised

  (9,697,146)  

$0.01- $0.03

 

Warrants expired/cancelled

  (3,116,550)  

$0.60

 
Outstanding at March 31, 2022  75,124,673